MT90840AP Zarlink, MT90840AP Datasheet - Page 39

• Manufacturer Part Number: MT90840AP
• Description: Switch Fabric 512 x 2430/512 x 512/2.373K x 2.373K 5V 84-Pin PLCC Tube
• Manufacturer: Zarlink

Specifications of MT90840AP

• Package: 84PLCC
• Number Of Ports: 16
• Fabric Size: 512 x 2430|512 x 512|2.373K x 2.373K
• Switch Core: Non-Blocking
• Port Speed: 8.192|4.096|2.048 Mbps
• Operating Supply Voltage: 5 V

Control Register (CR) - READ/WRITE
This register selects which 128 byte page of which internal memory will be accessed by the CPU when the address bit AD<7> is high.
(When address bit AD<7> is low, the control registers are accessed.)
SEL2-0
SEL2
HA11-7
To address serial time slots in TPDM or RPCM:
To address parallel time slots in RPDM or TPCM:
2 Mbps Balanced
2 Mbps Add/Drop
4 Mbps
8 Mbps
19.44 Mbyte/s
16.384 Mbyte/s
6.480 Mbyte/s
Parallel Port Data
0
0
0
0
1
1
1
1
Serial Port
Data Rate
Rate
Memory Select bits. Used by the CPU to select the internal memories of the MT90840 for read or write operations. SEL2-0 bits
have to be written before any READ/WRITE operation is performed on the internal memories.
High Address Bits 11-7. These bits select which 128 byte page of the selected memory (see SEL2-0 bits) will be accessed by
the CPU. Used along with AD0-AD6 input lines to address the MT90840 internal memories when the address bit AD<7> is
high. See RPCM, TPCM, RPDM and TPDM Address Mapping section for more details.
SEL1
SEL2
0
0
1
1
0
0
1
1
7
Number of Channels
2430
2048
810
Number of Serial Port Input
and Output Streams
8i x 8o (256 channels)
16 i/o (512 channels)
8i x 8o (512 channels)
4i x 4o (512 channels)
SEL1
SEL0
6
0
1
0
1
0
1
0
1
SEL0
Memory Selected for RD/WR operation
Receive Path Connection Memory Low (RPCM Low)
Receive Path Connection Memory High (RPCM High)
Receive Path Data Memory (RPDM)
Enable Memory Block-Programming feature for RPCM High
Transmit Path Connection Memory Low (TPCM Low)
Transmit Path Connection Memory High (TPCM High)
Transmit Path Data Memory (TPDM)
Enable Memory Block-Programming feature for TPCM High
5
HA11
4
HA bits and input address lines used to
select channel in TPCM.
HA11-HA7 + AD6-AD0
HA10-HA7 + AD6-AD0
HA9-HA7 + AD6-AD0
HA bits and input address lines, or
TPCM address bits, used to select ST
stream.
HA7 + AD6-AD5 / AB7-AB5
HA8-HA7 + AD6-AD5 / AB8-AB5
HA8-HA7 + AD6 / AB8-AB6
HA8-HA7 / AB8-AB7
Zarlink Semiconductor Inc.
HA10
3
MT90840
39
HA9
2
HA8
1
HA7
0
RPCM address bits used to select channel.
AB11-AB0
AB10-AB0
AB9-AB0
HA bits and input address lines, or TPCM
address bits, used to select the time slot.
AD4-AD0 / AB4-AB0 (32 time slots)
AD4-AD0 / AB4-AB0 (32 time slots)
AD6-AD0 / AB6-AB0 (128 time slots)
AD5-AD0 / AB5-AB0 (64 time slots)
Data Sheet